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Honeywell FC-GMLD16 Gas and Smoke Detector Input Module

The Honeywell FC-GMLD16, also cataloged as the FC-GMLD16 Gas and Smoke Detector Input Module, operates as a dedicated hardware component for monitoring detector loop signals within Honeywell Safety Manager and Fail Safe Controller systems. The module processes 16 field detector channels and performs loop status supervision with open-circuit and short-circuit diagnostics.

Hardware Specifications

Parameter	Specification
Model	FC-GMLD16
Brand	Honeywell
Origin	USA
Weight	Not specified
Dimensions	Not specified
Operating Temp	-5 deg C to +60 deg C
Power Consumption	Approximately 3 W to 5 W depending on loop load
Module Type	Gas / Smoke Detector Input Module
Compatible Systems	Honeywell Safety Manager / Fail Safe Controller (FSC)
Number of Channels	16 independent detector input channels
Supply Voltage	24 VDC nominal
Operating Voltage Range	20.4 VDC to 28.8 VDC
Field Loop Monitoring	Open-circuit and short-circuit detection
Electrical Isolation	Channel-to-bus galvanic isolation
Storage Temperature	-40 deg C to +85 deg C
Relative Humidity	5% to 95% non-condensing
Mounting Type	FSC / Safety Manager I/O rack slot

Channel-to-Channel Isolation and Safety Loop Monitoring

The Honeywell FC-GMLD16 applies channel-to-channel isolation methods to separate detector loop circuits and reduce interference between field inputs. Each channel independently evaluates gas and smoke detector loop conditions, while the module reports input status and fault states through the Safety Manager or FSC controller backplane.

Furthermore, the module continuously supervises field wiring integrity. It detects abnormal loop conditions, including open wiring and short circuits, allowing the safety controller to identify field connection faults before they affect protective functions.

The FC-GMLD16 follows Honeywell safety system design practices for SIS applications, where diagnostic coverage and deterministic input processing support safety-related shutdown logic execution.

Frequently Asked Questions

Q: How many detector loops can the FC-GMLD16 process simultaneously?
A: The FC-GMLD16 supports 16 independent gas or smoke detector input channels within one I/O module.

Q: Does the module detect field wiring faults?
A: Yes. The module monitors detector loops and identifies open-circuit and short-circuit conditions through integrated line fault diagnostics.

Q: Can the FC-GMLD16 be replaced during system operation?
A: The module supports hot-swap replacement when the installed Honeywell FSC or Safety Manager configuration permits live module exchange procedures.

Field Installation Guidelines

• Install the FC-GMLD16 only in compatible Honeywell FSC or Safety Manager I/O rack positions.
• Verify the 24 VDC power supply polarity and voltage range before connecting field wiring.
• Route detector loop cables separately from high-voltage power cables to reduce electrical noise coupling.
• Use proper shield termination practices according to the site grounding design and Honeywell installation documentation.
• Confirm each detector loop wiring connection before system commissioning.
• Check channel status indicators after installation to verify normal input operation and fault-free field connections.

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